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What weight oil is in the differentials of a 2001 ford f-150?

The recommended differential fluid weight for a 2001 Ford F-150 depends on the axle ratio and the climate where the truck is driven. Ford's owner's manual is the definitive source. However, without knowing the axle ratio, it's impossible to state the correct weight definitively.

Typically, 75W-140 is common for heavier-duty applications or colder climates, while 75W-90 might be specified for lighter-duty applications or warmer climates. Some F-150s even used a 80W-90.

To find the correct weight:

1. Check your owner's manual: This is the most reliable source of information. It will specify the recommended fluid weight based on your truck's specific configuration.

2. Look for a sticker on the differential: Sometimes there's a sticker on the differential cover indicating the recommended fluid type and weight.

3. Check the differential tag: This tag, usually located on the differential itself, might list the axle ratio. This, combined with your owner's manual or a Ford parts lookup based on your VIN, can help you find the correct fluid weight.

Using the incorrect weight can damage your differential. Always consult your owner's manual or a qualified mechanic for the correct specification.